Commentary for Avodah Zarah 70:2
רב מלכיא משמיה דרב אדא בר אהבה אמר מפני שמחליקין פניה בשומן חזיר רב חסדא אמר מפני שמעמידין אותה בחומץ רב נחמן בר יצחק אמר מפני שמעמידין אותה בשרף הערלה
R. Malkiah in the name of R. Adda b. Ahava said: [Cheese is forbidden] because they smear the surface with pig fat. R. Hisda said: Because they curdle it with vinegar. R. Nahman b. Yitzchak said: Because they curdle it with sap of orlah.
Daf Shevui to Avodah Zarah
These three amoraim give three more reasons why Gentile cheese is prohibited. Vinegar is prohibited because it comes from wine. Orlah is a tree in its first three years of growth, which is prohibited. It is interesting to note that everyone seems to know that it is prohibited but no one seems to know why.
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